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US Patent: 438,210
Printer's Quoin
Patentee:
William Wickersham - Worcester, MA

USPTO Classifications:
254/40

Tool Categories:
wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
J. E. Day
Wm. H Gates

Patent Dates:
Applied: Mar. 29, 1888
Granted: Oct. 14, 1890

Patent Pictures:
William Wickersham patent Oct. 14, 1890
USPTO pdf tiff
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Description:
The quoin is expanded by an internal cam, either of one continuous lobe, or of paired lobes.

The patent is included because of the square-ended quoin key.

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